There is not any Kasre. It is an old proverb that is not so common at the present and is used as an irony for "lazy people". This proverb mean "از جاي خودت اصلا تكان نخور آدم تنبل! من نان برات مي‌آورم، آب را هم با لوله مي‌كشم دم دهنت كه مجبور نشوي يك وقت تكان بخوري"

Well, we have an exact equivalent for "Pear, ripen (and) fall into my mouth!" too: هلو، برو تو گلو. The main meaning of this proverb is "it is really easy/occasion", but you can use it as a ironic proverb to pointing to a "lazy person" too.

Coming back to this delightful thread after a while, I'd like to ask if you could please translate نون نکش آب لوله کش fairly literally for me so I can see how the grammar works. Is the idea behind آب لوله کش that the water is laid on by a pipe to the other person's mouth, or rather that this is what he expects? Perhaps you can therefore use آب لوله کش for "running water", although I imagine there would have to be a kasre after آب.

Is the idea behind آب لوله کش that the water is laid on by a pipe to the other person's mouth

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Yes, it have exactly the same meaning.

Perhaps you can therefore use آب لوله کش for "running water"

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At the present, the water that is laid on by a pipe is called آب لوله‌كشي. At this proverb it is used as آب لوله كش just because of rhythm, but its meaning is as the same as آب لوله‌كشي شدهاز مكاني به مكان ديگر